ssrs code 39

ssrs code 39

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There s one problem here: AppKit thread safety. Remember, messaging any GUI object including our resultsTextView from a background thread is a no-no. Fortunately, GCD provides us with a way to deal with this, too. Inside the block, we can call another dispatching function, passing work back to the main thread! We do this by once again calling dispatch_async(), this time passing in the queue returned by the dispatch_get_main_queue() function, which always gives us the special queue that lives on the main thread, ready to execute blocks that require the use of the main thread.

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- (IBAction)doWork:(id)sender { NSDate *startTime = [NSDate date]; dispatch_async(dispatch_get_global_queue(0, 0), ^{ NSString *fetchedData = [self fetchSomethingFromServer]; NSString *processed = [self processData:fetchedData]; NSString *firstResult = [self calculateFirstResult:processed]; NSString *secondResult = [self calculateSecondResult:processed]; NSString *resultsSummary = [NSString stringWithFormat: @"First: [%@]\nSecond: [%@]", firstResult, secondResult]; dispatch_async(dispatch_get_main_queue(), ^{ [resultsTextView setString:resultsSummary]; }); NSDate *endTime = [NSDate date]; NSLog(@"Completed in %f seconds", [endTime timeIntervalSinceDate:startTime]); }); }

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We still have one more change to make, in order to make this behave the same and run at least as fast as our previous version that used NSOperationQueue. Remember that when we set up operations in the queue, we allowed calculateFirstResult and calculateSecondResult to run at the same time, through the use of dependencies We declared that each of them was dependent on the preceding call to processData, and that in turn the following call to finishWorking was dependent on both of them. That left it up to the operation queue to run both of those at the same time if possible. In what we currently have in our GCD version, that s not the case. The code runs straight through just as shown, always calling calculateSecondResult: only after calculateFirstResult: has completed. Fortunately, once again GCD has a way to accomplish the same thing, by using what s called a dispatch group. All blocks that are dispatched asynchronously within the context of a group are set loose to execute as fast as they can, including being distributed to multiple threads for concurrent execution if possible. We can also use

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As we saw in the preceding section, developers can create complex queries to extract data from multiple tables However, for queries that span more than a couple of tables, a sub-select can become overly complex

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dispatch_group_notify() to specify an additional block that will be executed when all the blocks in the group have been run. Here s what it looks like:

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- (IBAction)doWork:(id)sender { NSDate *startTime = [NSDate date]; dispatch_async(dispatch_get_global_queue(0, 0), ^{ NSString *fetchedData = [self fetchSomethingFromServer]; NSString *processed = [self processData:fetchedData]; __block NSString *firstResult; __block NSString *secondResult; dispatch_group_t group = dispatch_group_create(); dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{ firstResult = [self calculateFirstResult:processed]; }); dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{ secondResult = [self calculateSecondResult:processed]; }); dispatch_group_notify(group, dispatch_get_global_queue(0, 0), ^{ NSString *resultsSummary = [NSString stringWithFormat: @"First: [%@]\nSecond: [%@]", firstResult, secondResult]; dispatch_async(dispatch_get_main_queue(), ^{ [resultsTextView setString:resultsSummary]; }); NSDate *endTime = [NSDate date]; NSLog(@"Completed in %f seconds", [endTime timeIntervalSinceDate:startTime]); }); }); }

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One complication here is that each of the calculate methods returns a value which we want to grab, so we have to first create the variables using the __block prefix, which means that the values set inside the blocks are made available to the code that runs later. With all that in place, you should be able to Build & Run your app, and see the same behavior and performance that you saw after the first set of improvements (but not the additional changes we made, where we used Cocoa Bindings to improve the GUI s behavior while the work is being performed; applying the changes to the blockenhanced version of SlowWorker is left as an exercise for the reader). The difference lies in the structuring of the code itself. Remember that in Snow Leopard, NSOperationQueue has been reimplemented using GCD, so your app will have similar performance characteristics either way. It s up to you to decide which way you want to go.

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